Radio toning device



July 19, 1932. w, c I 1,868,357

RADIo TONING DEVICE Filed Nov. 9, 1931 2 Sheets-Sheet 1 Invcnldr flllorney July 19; 1932. HM 1,868,357

RADIO TONING DEVICE Filed Nov. 9, 1951 2 Sheets-Sheet 2 a \w N w 1 S3 a (S \Y 4 r P \a ,4 I Inventor 4 f 5 war/1 2262222 Patented July 19, 1932 WARREN C. BILL, OF EVANSVILLE, INDIANA RADIO TONING DEVICE V Application filed November 9, 1931.

This invention appertains to new and use- I ful improvements in means for toning radio signals so that they will be received in a pleasing pitch not unpleasant to the hearmg, especially when ear phones are being employed.

i n important object of the invention is to provide a toning device capable of especia ly transforming a wireless code signal (constant audio frequency) to a more pleasant tone, with atmospheric disturbances minimized.

Other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings Figure 1 represents a diagrammatic view disclosing the manner in which the device is used in conjunction with a radio receiver.

Fig. 2 represents a longitudinal sectional view through the apparatus making up the present invention.

Fig. 3 represents a cross sectional view taken substantially on line 33 of Fig. 2.

Fig. 4 represents a cross sectional view taken substantially on line 44 of Fig. 2.

. Fig. 5 represents a perspective view of one of the resonance tubes.

Referring to the drawings wherein like 30 numerals designate like parts, it can be seen that this toning device includes an elongated casing 5 having the vertically extending partitions 6, 7 and 8 mounted therein, the partitions 7 and 8 defining a chamber 9 while the partitions 6 and 7 define a. chamber 10.

Disposed through an opening and a guide 11 in the artition 6 is a resonance tube 12 horizontal y disposed and having the piston 13 operative therein. Numeral 14 represents a stop member to prevent displacement of 'the piston 13 in the direction of the gear 15 which is mounted on the shaft 16 and operated by the external knob'17 on the outside of the casing 5.

The piston 13 is provided with an elongated rack bar 18 operative through the guide 19 and in mesh with the gear 15, and obviouslv by rotating the knob 17, the piston 13 can be fed backwardly and forwardly in the 50 resonance tube 12.

Serial No. 574,009.

The end port-ion of the resonance tube 12 within the chamber 10 is provided with an opening 20 over which the transmitter 21 is disposed. the transmitter being supported by the bracket 22.

Projecting through the partitions 7 and 8 and terminating within the chambers 10 is the resonance tube 23 which has a piston 13 operative therein with a rack bar 18' extending therefrom-and through the guide 19'. A gear v15 operated by the shaft 16 meshes with the rack bar 18 and is actuated by the knob 17 on the outside of the generally refers to the present invention which is connected to the receiver and from this device 28', connection is made to the amplifier 29 which is hooked up to the loud speaker or to earphones, as the case may be.

Obviously, this re-toning of the received signal is very desirable for aviators as well as radio operators on ships and other places, where a good deal of static is mixed with the signal, making it almost intolerable at tirpes to try and listen to the incoming signa s.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as new is 1. A toning device for radio receivers comprising a primary chamber, a secondary chamber. a resonance tube projecting into and terminating within the primary chamber, a second resonance tube projecting through the secondary chamber and terminating within the primary chamber, said first-mentioned tube being provided with an opening in the side thereof at a point within the primary chamber and provided with a transmitting diaphragm located thereover, the second-mentioned tube being provided with an opening in the side thereof, within the secondary chamber, a mi rophonio diaphragm located over the last-mentioned opening and closures for the ends of the tubes outwardly of the said chambers.

A toning device for radio receivers comprising a primary chamber, a secondary chamber, a resonance tube projecting into and terminating within the primary chamber, a second resonance tube projecting through the secondary chamber and terminating within the primary chamber, said first-mentioned tube being provided with an opening in the side thereof, at a point within the primary chamber and provided with a transmitting diaphragm located thereover, the second-mentioned tube being provided with an opening in' the side thereof, within the secondary chamher, a microphonic diaphragm located over the last-mentioned opening and closures for the ends of the tubes outwardly of the said chambers, said ciosures being adjustable to vary the air column in the said tubes,

3. A toning device for radio receivers comprising a. primary chamber, a secondary chamber, a resonance tube rojecting into and terminating within the primary chamber, a second resonance tube projecting through the secondary chamber and terminating within the primary chamber, said first-mentioned tube being provided with an opening in the side thereof at a point within the primary chamber and provided with a transmitting diaphragm located thereover, the second-mentioned tube being provided with an opening in the side thereof, within the secondary chamber, a microphonic diaphragm locatedover the iast-mentioned opening and closures for the ends of the tubes outwardly of the. said chambers, said closures being slidabiy disposed in the said tubes, and means whereby the said closures can be set at adjusted positions.

4. A toning device for radio receivers comprising a primary chamber, a secondary chamber, a resonance tube projecting into and terminating within the primary chamber, a, second resonance tube projecting through the secondary chamber and terminating within the primary chamber, said first-mentioned tube being provided with opening in the side thereof at a point within the primary chamber and provided with a transmitting diaphragm located thereover, the second-mentioned tube being provided with an opening in the side thereof, within the secondary chamber. a microphonic diaphragm located over the last-mentioned opening and closures for the ends of the tubes outwardly of the said chambers said closures being in the form of pistons slidable in the tubes, and manual means whereby the said pistons can be operated to adjusted positions.

5. A. toning device for radio receivers com-- prising a primary chamber, a secondary chamber, a resonance tube projecting into and chambers, said closures consisting of slidable pistons operative longitudinally within the tubes, rack bars extending from the pistons, a shaft for each rack bar, a knob for rotating each shaft, and a gear on the shaft for mesh with the corresponding rack bar.

In testimony whereof I aflix my signature.

WARREN C. HILL. 

